Hey guys. I downloaded Mountain Lion again and made a bootable USB drive in order to clean install OS X 10.8; however I need to recover my free space on the USB. I tried "Erasing" the flash drive using Disk Utility but it now says that my USB thumbdrive has 200MB of free space (!) while it's a 16GB device. How can I completely erase it and eventually be able to use my USB as I could before (like you know dragging powerpoint and word files in it, etc.)

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